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USA UNS S44600
AISI
American Iron and Steel Institute		 446
Corresponding Standard ASTM A959-2019
Specifying Harmonized Standard Grade Compositions for Wrought Stainless Steels
Classification Ferritic Stainless Steel
Properties Corrosion Resistance
Chemical Element Composition Content (%)
Component C Si Mn P S Cr Ni N
Minimum Value - - - - - 23 - -
Maximum Value 0.2 1 1.5 0.04 0.03 27 0.75 0.25
• Unless otherwise indicated, a grade designation originally assigned by the American Iron and Steel Institute (AISI).
1 Approximate Comparison Table Ferritic Heat-Resistant Steel
China Taiwan, China Japan South Korea United States
GB ISC CNS JIS KS ASTM UNS
16Cr25N
(2Cr25N) 		S12550 SUH 446 SUS 446 STR 446 446 S44600
2 Approximate Comparison Table Ferritic Stainless Steel
China Japan United States International Organization for Standardization European Standard
ISC JIS ASTM UNS ISO Numerical Grade EN Numerical Grade
S12550 SUH446 446 S44600 X15CrN26 4749-446-00-I X18CrN28 1.4749
3 Approximate Comparison Table Ferritic Stainless Steel
United States France European Standard
ASTM UNS NF EN/NF EN Numerical Grade
446 S44600 X15CrN26 X18CrN28 1.4749

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